Central Authentication Service - OpenKM 6.2

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The Central Authentication Service (CAS) is a single sign-on protocol for the web. Its purpose is to permit a user to access multiple applications while providing their credentials (such as userid and password) only once. It also allows web applications to authenticate users without gaining access to a user's security credentials, such as a password. The name CAS also refers to a software package that implements this protocol.

First of all you should read about how CAS works. So I recommend to read these articles:

According to the CAS documentation, it only works in secured HTTPS connections. For this reasong you need to configure HTTPS under Tomcat. Uncomment the "SSL HTTP/1.1 Connector" entry in $TOMCAT_HOME/conf/server.xml. Once you have modified it, start Tomcat and access https://localhost:8443/ to check it works fine.